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11:6
METALLURGY OF IRON AND STEEL.
be appropriated by its own silica. In this way, 10 pounds of the liine out of every 100 pounds is used in satisfying itself.
The silica derived from the lime and from the silicon does not entirely determine the quantity of lime, for there is a limit to the content of phosphoric acid in the cinder. Thus, if a bath of ,15,000 pounds, contains 3 per cent, of phosphorus, it will produce 1030 pounds of phosphoric acid, and if the final slag is to contain 50 per cent. CaO and not over 20 per cent. P205, then this slag must weigh 5X1030=5150 pounds, so that HfLft=2575 pounds of CaO must be added to the charge. It is not specified in this case that the CaO shall be "unsatisfied/ for it will be immaterial what the silica may be in the lime, as long as the demands of silica are met.
SEC. Ylld.—Chemical reactions.—The chemical history of the basic converter is shown in Table VII-A, which gives the analyses of metal, slags and gases at various stages of the operation, as given by Wedding. The high percentage of oxygen and carbonic
TABLE VII-A. Metal, Slag and Gases from the Basic Converter.
Time from Beginning. i	Metal.					Slag.								
	SI	C	P	S	Mn'	SiOa	CaO		PaO.		FeO	FeaO,	MnO	MgO
Pig Iron No. 1 2m. 46s. 6m. 21s. 8m. 6s. 10m. 45s. 18m. 28s. 15m. 18s. 19m. 14s. 19m. 81s. 19m. 49s. Ball Steel,	1.22 0.72 0.15 0.007 0.012 0.005 0.008 0.005 0.005 0.004 0.01	8.21 8.80 8.12 2.47 1.49 0.75 0.05 0.02 0.02 0.26'	2.183 2.148 2.224 2.157 2.096 2.053 1.910 0.230 0.189 0.087 0.145	.080 .047 .051 .049 .051 .051 .055 .060 .055 .056 .046	1.03 .71 .50 .18 .16 .14 .01 .01 '.48									
						41.15 86.30 84.41 31.94 16.64 14.66 12.94 12.20 11.71 12.77	41.27 89.50 42.80 48.12 44.87 46.63 47.76 48.59 48.19 47.87		0.84 8.12 2.99 4.02 7.15 11.60 18.88 18.66 18.15 16.92		2.40 8.9Y 8.60 4.28 8.42 7.15 5.84 6.79 7.19 5.94	' 6.46 ' 0.18 0.74 4.95 8.84 8.74 2.80 2.78 2.87	9.08 11.02 10.72 9.94 8.61 7.89 4.25 4.01 4.05 4.80	4.13 8.89 8.35 4.01 7.84 6.34 6.00 6.26 6.88 6.75
Pig Iron No. 2 About 8m. "     6m. "     9m. "   12m. "   15m. Steel,	0.58 0.28 0.07 0.07 0.06 0.02 0.02	8.60 2.81 2.02 1.83 0.71 0.106 0.186	2.75 2.57 2.08 2.25 1.55 0.061 0.084	.079 .079 .073 .074 .079 .064 .046	1.57 2.50 0.30 0.84 0.26 0.21 0.55									
						9.20 9.60 9.80 10.28 6.99 4,79	76.10 71.40 66.17 60.71 46.84 42.06		2.94 6.90 7.82 15.87 24.78 16.38		0.55 0.7.8 2.30 7.18 11.98 26.08		8.87 9.70 8.42 9.46 6.40 4.62	4.86 6.88 6.47 6.90 4.09 6.88
Heat No. 882.	Metal.					Gas.								
	81	C	P	. S	Mn	OOa		0		CO		CH4         N		
Sample 1 '<       8 11       4 "       6	.28 .07 .07 .06 .02	2.81 2.02 1.38 .71 .105	2.57 2.08 2.25 1.65 .061	.079 '.073 .074 .079 .054	2.50 .80 .84 .26 .21	3.5 8.0 8.0 1.8 1.2		8.1 8.0 0.3 0.2 0.8		2.0 10.6 28.3 29.8 1.6		0.9          86.0 1.0          81.4 1.6          66.6 1.8          65.0 0.9          95.6